fEaTURE ] URbaN SUSTaINabIlITy
pROJEcT DETaIlS
Annual values for volume and % reduction are
based on the daily rainfall data for Boston from
1996 to 2004 and consider, on an average annual
basis, the total rainfall in a given year and how
mu ch of that total rainfall occurs during storm
events that produce one inch or less of rain.
• The 320 Newbury Street building has a total
roof area of 5,800 sf. The portion of that area
that will be Green Roof is 4,350 sf.
• The Green Roof can absorb up to one-inch
of rainfall. Anything above that is runoff and
will be collected by the roof drains.
• The total project area, including the expanded
alley, is 16,537 sf.
• The combination of the Green Roof and Green
Alley can absorb/infiltrate up to one -i nch of rainfall
over the entire project site (320, 322, 951 and
alley). Anything above that is runoff and will over-
flow to the combined sewer system in the alley.
320 Newbury Street building Total Volume
of Rainfall = 151,482 gallons; Volume of Rainfall
Absorbed by Green Roof = 95,336 gallons;
% Reduction in Runoff from 320 Building = 62.9%
project Site Total Volume of Rainfall = 431,908
gallons; Volume of Rainfall Infiltrated by Green
Alley/Absorbed by Green Roof = 362,431 gallons;
% Reduction in Runoff = 83.9%
Renderi ng by halvor so n Design pa r tnership
Renderi ng by halvor son Design par tnership
pRacTIcE
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